the paint on my house is in perfect condition,want to repaint do I need to use primer?
Answers:
That depends on whether you're going over alkyd or latex paint. If it's latex, then no (most paints bond well enough to latex) although it might take two coats for major color changes (two coats almost always increase the depth and richness of the finish). If you don't know which it is, take a powerful solvent like liquid sandpaper, put some on a rag and wipe a small spot on the wall for about five seconds. If the paint comes off on the rag, it's latex.
If it's alkyd, then you will have to sand and prime. The primer may claim to adhere without sanding. This is because people hate sanding and wouldn't buy their product if they were told the truth. It will adhere well enough to hold on THAT coat of paint. However, each coat of paint shrinks down as it dries, putting tension on the previous coat. Eventually this tension will build up enough to pop the paint off at the weakest point of adhesion
Other answers:
Primer is needed for two reasons. First it will make the paint stick to the wall. Basically primer acts like a glue. The other reason for primer is to hide the last color behind it. If current paint is a light color then one coat of primer is good enough. Otherwise I would suggest two coats.
Primer is needed for two reasons. First it will make the paint stick to the wall. Basically primer acts like a glue. The other reason for primer is to hide the last color behind it. If current paint is a light color then one coat of primer is good enough. Otherwise I would suggest two coats.
as long as the paint is sticking good there should not be a problem. Be sure to clean the surface to be painted.
If the paint is in good condition as you say - unless you're painting your house a different color you dont need a primer coat.
If you're changing colors YES you need a primer.
Just make sure that you scrape off any peeling paint that you may have..then, SPOT prime it like you did before.
It also depends on the color that you chose though..You will want it to cover properly.
Some validity in other answers.
I've been doing this for more than 25 years. I always check the staus of the older paint job, as well as any damage, and certainly if the orig color is darker than the one asked for, I'd consider primer, but I use quality materials, and usually two coat a house, unless I'm spraying it. I spray most often now.
One thing I suggest, not knowing your color choices, is to pressure wash the current finish,,,Gently perhaps, but that does sooooooooo much to help prep a house, and avoid issues as you progress.
Use a quality product, which will include higher levels of pigment and polymers than low grade paints.
Rev. Steven